<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1" width="500" align="center">

    <tr>

        <td colspan="3" align="center" height="100">网站头部</td>
    </tr>
    <tr>
        <td colspan="3">
            <table border="1" width="100%">
                <tr>
                    <td  width="50%">网站标题</td>
                    <td  width="50%">搜索框</td>
                </tr>
            </table>
        </td>
    </tr>
    <tr>
        <td height="200">
            <table border="1" height="200" width="100%">
                <tr>
                    <td>1</td>
                    <td>2</td>
                </tr>
                <tr>
                    <td>3</td>
                    <td>4</td>
                </tr>
            </table>
        </td>
        <td>中</td>
        <td>右</td>
    </tr>
    <tr>
        <td colspan="3" align="center">网站底部</td>
    </tr>
</table>
<br>

</body>
</html>